Scott Brown stuck in neutral

May I ask one simple question: What in this wide and wonderful world is Scott Brown thinking?

Our junior senator is, as everyone in Massachusetts well knows, the Luckiest Man in America. He has an accomplished wife, a pair of smart and successful daughters, and model good looks. He was blessed in that lightning strike of a Senate campaign with an opponent that lacked any semblance of intuition about those people known as voters. In the end, a barn jacket and a pickup truck were all he needed to vote on the START treaty.